JPH0422042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a radiator in a parabolic antenna for receiving microwave radio waves.

Its purpose is to provide a radiator 14 to be placed in front of the reflecting mirror 1, and the radiator 14 is a hollow power supply case 1 made of a metal material.
5, and two rod-shaped dipole elements 24, which are located opposite to each other on both sides of the power supply case 15 and have their bases penetrating through the power supply case 15, respectively.
24 and a reflector-like element 34 mounted on the front side of the feeder case 15.
On the rear side, one end of a hollow cylindrical take-out tube 8 that is long in a direction crossing the axial direction of the dipole is connected to the internal space of the power supply unit case 15 in a state where it communicates with the inner space, and a holding tube is connected to the rear side. Inside the ejecting tube 8, there is a hollow cylindrical insulating tube 47 whose outer diameter corresponds to the inner diameter of the ejecting tube 8, and inside the insulating tube 47,
A tubular body 41 in which two matching elements 42a, 42a are formed by providing slits 43, 43 which are long in the axial direction and have an opening on the front side at two locations around the periphery is supported by the insulating cylinder 47 and is concentrically arranged. The outer conductor 53 of the coaxial cable 50 is placed on the rear side of the tube body 41, and the front end portion 42b,
42b is connected to the base portions 25a, 25a facing each matching element of the dipole-shaped elements 24, 24, and the center conductor 51 of the coaxial cable 50, respectively. Connection points between the base portions 25a, 25a of the elements 24, 24 of both dipoles and the tip portions 42b, 42b of the tube body 41 are connected in both directions intersecting the axes of the elements 24, 24 and the respective axes of the take-out tube 8. A window hole 18 is drilled in each window hole 18 to allow the user to see the information, and by attaching a cover 38 to each window hole 18, the assembly becomes simple, the assembly accuracy is high, and the high frequency characteristics are improved. It is an object of the present invention to provide a radiator for an antenna that is also good.

The drawings showing the embodiments of the present application will be described below. Reference numeral 1 denotes a well-known reflecting mirror, the front surface of which is concave. Reference numeral 2 denotes a reinforcing frame along the back surface of the reflecting mirror 1, and its peripheral edge 2a and central portion 2b are both in contact with the back surface of the reflecting mirror 1. Reference numeral 3 denotes a primary radiator support body attached to the central portion (or an eccentric position) of the reflecting mirror 1, and is made of a metal material. Note that this is not limited to a conductive material, but may be formed of an insulating material. In this support body 3, reference numeral 4 denotes a substrate, which is placed against the front surface of the reflecting mirror 1. Reference numeral 5 denotes a tightening plate, which is attached to the back side of the reinforcing frame 2, and is secured to the board 4 using fixing bolts 6.
A reflecting mirror 1 and a reinforcing frame 2 are integrally sandwiched between the substrate 4 and the clamping plate 5. Reference numeral 7 indicates a support portion, which is formed into a cylindrical shape as shown in the figure. Reference numeral 8 denotes a take-out tube, which is made of a material having sufficient strength, such as a brass tube, and is fixed to the support portion 7 by brazing means after being inserted. The portion consisting of the take-out tube 8 and the support section 7 is also referred to as a support tube 9 in this specification. This support tube 9 is for keeping the primary radiator at a constant distance and position from the reflecting mirror. Reference numeral 10 denotes a locking tube protruding from the substrate 4 toward the back side of the reflecting mirror 1, into which a tightening nut 11 is screwed. Also, a packing 12 (for example, an elastic material such as chloroprene rubber is used) is provided between the stepped portion 10a provided on the locking tube 10 and the tip of the tightening nut 11.
is interposed. This packing 12 is expanded inward by tightening the tightening nut 11,
It is crimped onto the outer peripheral surface of a cable 50, which will be described later.

Next, the primary radiator 14 (dipole type with a reflector) attached to the tip of the carrying tube 8 will be explained. Reference numeral 15 denotes a power feeding unit case, which is hollow and made of a metal material with good conductivity, such as brass, for shielding. 16 is the rear wall 1 in the case 15
5c (Note that with regard to the "front" and "rear" directions, in this specification, the front direction of the reflector, that is, FIGS. 3 and 4)
The right side in the figure is called the front, and the opposite direction is called the back. ) and is placed over the tip of the take-out tube 8. In addition, at this covering portion, the take-out tube 8 and the case 15 are fixed by brazing means. 17 and 17 are case 15 respectively.
The mounting hole is a screw hole formed in a pair of opposing side walls 15a, 15a. 1
Reference numeral 8 denotes a window hole, which is bored in another side wall of the case 15 between the pair of side walls 15a, 15a. This window hole 18 is also constructed with a screw hole. Reference numeral 20 denotes an insulating seat, which is composed of a flange portion 21 and a threaded portion 22, and the threaded portion 22 is threaded into the mounting hole 17. The insulating seat 20 is made of an insulating material that is resistant to heat and has low dielectric loss, such as fluororesin. 23 is a gasket, which is interposed between the flange 21 and the side wall 15a of the case 15. This packing 23 is made of a material with sufficient elasticity, such as chloroprene rubber. Even if the dielectric loss of the material used is large, this packing 23 does not have much influence because the size of the packing 23 is small. Reference numeral 24 denotes a dipole element, which is made of a material with good conductivity, such as a brass rod. This element 2
4 may be hollow or solid. In this element 24, 24a is a main body, and 25 is a small-diameter through-hole, which is press-fitted into the through-hole 20a of the insulating seat 20. Also, the tip of the penetrating portion is the connecting portion 25a.
The connecting portion 25a is exposed inside the hollow case 15. Reference numeral 26 denotes a step portion formed around a portion of the main body 24a from which the penetrating portion 25 protrudes, and this step portion 26 and the flange portion 2 of the insulating seat 20
A gasket 27 is interposed between the two. The packing 27 is the same as the packing 23 described above. Reference numeral 28 denotes a waterproof cap, which is tightly attached to the outer periphery of the dipole element 24. Also, the end on the case 15 side is the side wall 15 of the case 15.
It is in contact with a. This cap 28 is used to prevent the insulating seat 20 and packings 23, 27 from deteriorating due to ultraviolet rays. The cap 28 is made of a material with low dielectric loss, such as acetal resin. Next, reference numeral 29 indicates a fixing base provided on the front wall 15b of the case 15, and is formed integrally with the case 15. In this fixing base 29, numeral 30 is a spacer portion, which is a portion for maintaining the distance between the dipole element 24 and the reflecting plate 34. Reference numeral 31 denotes a through portion, which is formed into an oval shape as clearly shown in FIG. 32 is a step for positioning, and 33 is a screw hole. Next 34
is a reflective plate, which is made of a metal material with good conductivity, such as an aluminum plate. This reflective plate 34 is placed against the positioning step 32 with the through hole 31 provided in the reflective plate 34 (a through hole having a shape corresponding to the through hole 31) passing through the through hole. In this state, it is fixed to the fixing base 29 by tightening the threaded rod 35. 36 is a well-known washer, and a reflector 34
and the head of the threaded rod 35. Next, 38 is a lid, and the window hole 18 of the power supply unit case 15 is
It is made of a material with good conductivity (for example, brass or iron) for shielding purposes, and is removably screwed into the window hole 18. 39 indicates a well-known patchkin.

Next, reference numeral 40 denotes an alignment member provided so as to extend from the inside of the tip of the take-out tube 8 to the inside of the power supply part case 15. In this case, 41 is a tubular body made of a material with good conductivity, such as a brass tube. In this tube body 41, reference numeral 42 denotes a matching portion, which is arranged so that two parts of the surrounding area form a split coaxial type balun.
Slits 43, 43 that are long in the axial direction are formed at the locations. 42a, 42a are slits 43,
43 shows two matching elements separated by 43. 42
b, 42b are the tips of each element 42a, 42a,
It serves as a dipole element connection part. Note that a through hole 42c is formed here. The above slit 43
The length of is set to about 1/4 wavelength of the received signal. 44
indicates a step for positioning. 45 indicates a fastening part;
It is formed to have a small diameter as shown in the figure, and a retaining part 46 having a slightly larger diameter is formed at the end of this retaining part 45 on the opposite side from the alignment part 42. Reference numeral 47 denotes an insulating cylinder provided around the matching part 42, whose inner diameter is approximately equal to the outer diameter of the matching part 42, and whose outer diameter is approximately equal to the inner diameter of the take-out cylinder 8. It is designed to prevent large wobbling between the insulating tube 47 and the matching portion 42. Also, this insulation cylinder 4
7, an engaging portion 48 is configured to engage with the step portion 44 for positioning to achieve positioning with respect to the alignment portion 42. The insulating tube 47 is made of a material with low dielectric loss, such as fluororesin, and its length is determined as follows.
That is, the area of the matching portion 42 that shields the slit 43 is designed to optimize the impedance conversion of the split coaxial balun. Furthermore, this insulating cylinder 47 is formed to have the above-mentioned thickness so as to hold the tube body 41 at the center (axial center position) of the take-out cylinder 8. Next, 50 is a well-known cable, 51 is a center conductor, 52 is an inner insulator, 53 is an outer conductor, and 54 is a jacket. As the cable 50, a 50Ω type coaxial cable (for example, 5D2W) is used. 55 indicates a crimping ring for fixing.

Next, the assembly of the above structure will be explained. First, the primary radiator 14 is assembled by attaching the threaded portion 22 of the insulating seat 20.
After passing it through the packing 23, it is screwed into the mounting hole 17 of the power supply unit case 15. After that, dipole element 2
4, that is, the penetration portion 25, is inserted into the packing 27, and then press-fitted into the through hole 20a of the insulating seat 20. This operation is also performed for the other dipole element 24. Further, the reflecting plate 34 is attached to the fixing base 29 using a threaded rod 35 and a washer 36. In this way, assembly of the primary radiator 14 is completed. Note that the press-fitting of the penetrating portion 25 into the through hole 20a may be performed prior to the screwing of the threaded portion 22 into the mounting hole 17. Further, the reflection plate 34 may be attached before the dipole element 24 is attached.

Next, the cable 50 and matching member 40 are connected. For this connection, first, the tip of the cable 50 is stripped in layers as shown in FIG. Next, the insulating tube 47 is placed over the tube body 41 at the alignment member 42 . Thereafter, the distal end of the cable 50 which has been peeled off is inserted into the tube body 41. in this case,
The center conductor 51 is exposed from the tip of the tube body 41, and the outer conductor 53 is made to cover the outer circumferential side of the fastening part 45. After that, the caulking ring 55 is caulked and the outer conductor 5 is
3 to the fixing part 45, and the center conductor 51
is soldered to the tip of one element 42a in the matching section 42. This completes the connection between the cable 50 and the matching member 42 as shown in FIG. 9.

Next, the connection between the matching member 42 and the primary radiator 14 will be explained. By the above operation, the 9th
Cables 50 interconnected as shown
Then, the alignment member 40 is inserted into the take-out cylinder 8 through the locking cylinder 10 of the primary radiator support 3, as shown in FIG. The two elements 42a and 4 of the matching part 42 in the matching member 40
2a enters the power supply case 15 through the through hole 16 as shown in FIG. In this case, as shown in FIG.
4 and 24 along the connecting portions 25a and 25a. In this way, the matching part 42 is connected to the connecting part 25a.
The operation of aligning the tips 42b, 42b of the elements 42a, 42a can be easily performed by visually viewing through the window hole 18. After that, the connecting member 57 is inserted into the case 15 through the window hole 18, and the connecting part 25a and the element 42 are connected.
The distal end portion (connecting portion 42b) of a is mutually connected. For example, solder is used as the connection member 57. This operation can be easily and precisely performed by inserting a soldering iron into the case 15 through the window hole 18 and applying the soldering iron to the adjacent portion of the connecting portion 25a and the connecting portion 42b. I can do it. In the case of this soldering, the connection part 42b has a through hole 4.
2c is formed, the heat of the soldering iron is concentrated around the through hole 42c, making the soldering work easier. After the above connections are completed, the lid 38 is screwed onto the window hole 18 to seal the case 15. On the other hand, in the locking cylinder 10, the tightening nut 11 is screwed in and the inner peripheral surface of the packing 12 is secured to the cable 50.
to prevent the cable 50 from rotating unnecessarily.

Next, the primary radiator support 3 is assembled to the reflector 1. This operation is performed by inserting the cable 50 into the through holes of the reflector 1 and the reinforcing frame 2, as shown in FIG. Connection can be made by tightening.

The parabolic antenna assembled as described above is installed, for example, outdoors on a roof or on the ground using a well-known support device not shown. In this state, microwave radio waves sent from a microwave transmission equipment such as the geostationary satellite 56 (for example, AM-FM at 1691MHz from Himawari 2)
The modulated and linearly polarized radio waves are reflected by the reflecting mirror 1 and focused toward the primary radiator 14 . The focused radio waves are reflected by the reflector plate 34,
The signal is received by the dipole element 24 in a well-known manner. The received signal is taken out to a cable 50 with good matching via the matching member 40, and further passes through the cable 50 to the subsequent equipment (converter,
receiver, personal computer, etc.).

Next, FIG. 11 shows a different embodiment of the present application, in which two window holes are formed in the power supply case to more reliably connect the base of the dipole element to the matching member. It is. In the figure, the window hole 18e is located on the side wall 15ae, on which the dipole element 24e is attached, in the power supply case 15e.
The element 24e is formed on the other two side walls between the elements 15ae and 24e through the window holes.
The connecting portion 25ae of the element 42ae and the connecting portion 42be of the element 42ae are connected by a connecting member 57e.

It should be noted that the same reference numerals as those in the previous figure are appended with an alphanumeric letter "e" for parts that are functionally the same or equivalent to those in the previous figure, and redundant explanations are omitted.

As described above, in the present invention, when inserting the tube body 41 into the take-out tube 8, since the insulating tube 47 is provided, both can be connected by simply inserting the tube body 41 into the take-out tube 8. There is an effect that the positional relationship can be accurately concentrically positioned and good high frequency characteristics can be formed.

Moreover, the insulating tube 47 plays an electrical role, and also has the tip portion 42b of the tube body 41.
It has the effect of also having the function of positioning between the base portions 25a, 25a of the two dipole elements 24, 24. This has the utility of determining the positions of three parties and facilitating connection.

Furthermore, since the connection points of the three parts are fixed, there is an advantage that the shape of the window holes 18 formed on these sides can be made smaller. That is, even if the diameter is small, the connection point is located at a fixed position, so it can be seen, and even if the diameter is small, the above-mentioned three connection operations can be performed accurately from the outside.

Moreover, if the window hole 18 is made smaller in diameter, there is an advantage that there is less possibility that the mechanical strength will be lost even if the power supply part case 15 is downsized.Furthermore, the lid 38 can also be made correspondingly small in diameter, making it waterproof. In terms of effectiveness, it also has the effect of increasing reliability than a large lid.
etc., the present invention is not only effective in simplifying the assembly of antenna radiators, but also has excellent usefulness in terms of improving the high frequency characteristics and waterproof reliability of the assembled antenna radiators. demonstrate.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view showing the state of microwave reception, FIG. 2 is a partial perspective view showing the state in which the primary radiator support is assembled to the reflecting mirror, and FIG. The figure is a partial view of a parabolic antenna partially cut away, and FIG. 4 is a partial view of the parabolic antenna cut away in a direction different from that shown in FIG.
Figure 5 is a plan view of the power supply case with the lid removed, Figure 6 is a sectional view taken along the - line, and Figure 7 is an exploded perspective view to explain the related structure between the power supply case, dipole element, and lid. Figure 8 is an exploded perspective view showing the relationship between the cable and the matching member, Figure 9 is a perspective view showing the state in which the cable and the matching member are connected, and Figure 10 is an exploded perspective view showing the relationship between the cable and the matching member. FIG. 11 is a perspective view for explaining assembly; FIG. 11 is a diagram similar to FIG. 6 showing a different embodiment; DESCRIPTION OF SYMBOLS 1...Reflector, 9...Support tube, 14...Primary radiator, 15...Power supply unit case, 24...Dipole element, 40...Matching member, 18...Window hole, 38
……lid.

Claims (1)

[Claims] 1 Emitter 14 to be placed in front of reflector 1
The radiator 14 is located opposite to a hollow power supply case 15 made of a metal material and on both sides of the power supply case 15, and its base is connected to the power supply case 15.
In the antenna radiator 14, which is composed of two rod-shaped dipole elements 24, 24, which are respectively inserted through the antenna, and a reflector-shaped element 34, which is attached to the front side of the power supply part case 15, On the rear side of the power supply case 15, one end of a hollow cylindrical take-out tube 8 extending in a direction perpendicular to the axial direction of the dipole is in communication with the internal space of the power supply case 15. A hollow cylindrical insulating cylinder 47 whose outer diameter corresponds to the inner diameter of the ejecting cylinder 8 is disposed inside the ejecting cylinder 8 and is connected to the ejecting cylinder 8. The tube body 41, in which two alignment elements 42a, 42a are formed by providing slits 43, 43 which are long in the direction and have an opening on the front side, is supported by the insulating tube 47 and placed concentrically. The outer conductor 53 of the coaxial cable 50 is disposed on the rear side of the tube body 41, and the base portion 25 facing each matching element of the dipole-shaped elements 24, 24 is disposed on the front end portions 42b, 42b.
a, 25a and the center conductor 51 of the coaxial cable 50, and further connect the power supply part case 1.
5, in both directions intersecting the respective axes of the dipole elements 24, 24 and the take-out tube 8,
The base portion 25 of the elements 24, 24 of both dipoles
A window hole 18 is formed so that the connecting point between a and 25a and the tip end portions 42b and 42b of the tube body 41 can be seen, and a lid 38 is attached to each window hole 18. Radiator for antenna.